The pain could be due to tendonitis (inflammation of tendon), ligament injuries, or muscle
injury. Usually the popping sound indicates a ligament or tendon
injury. You need to apply ice pack, give rest to the fingers, and take non-steroidal anti-inflammatory such as tylenol, ibuprofen, or naproxen. Please consult your doctor regarding this. You may need an X-ray and MRI. Take care!